Sesamoid arthrodesis for moderate metacarpophalangeal hyperextension associated with trapeziometacarpal osteoarthritis treated by total arthroplasty.

A total of 32 (12.5%) thumbs were treated with trapeziometacarpal osteoarthritis and moderate metacarpophalangeal hyperextension (30º-50º), placing the Arpe® implant and sesamoid arthrodesis of the metacarpophalangeal joint in the metacarpal bone head. In 28 patients were treated with radial sesamoid arthrodesis at the metacarpal head and 4 patients with ulnar sesamoid arthrodesis.All patients were functionally stable at final follow-up, with a correction of the hyperextension deformity, although 2 patients with ulnar sesamoid arthrodesis had a new surgical procedure due to reproduction of the metacarpophalangeal hyperextension deformity.The mean pinch strength increased significantly. The preoperative VAS score was 6.7 and the postoperative was 1.4. The preoperative DASH score was 51.8 and in the last review it was 12.6.The purpose of the study is to evaluate the results of the sesamoid arthrodesis as a treatment of moderate (30º-50º) metacarpophalangeal hyperextension in patients undergoing type Arpe® total trapeziometacarpal arthroplasty